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Lochinvar & A.O. Smith 100304989 Ignitor 319852-301 What is the proper orientationThe Lochinvar & A. O. Smith 100304989 Ignitor is a critical OEM replacement part engineered for high output commercial boiler ignition. As a veteran grade hot surface igniter, this component is specifically calibrated for use in Lochinvar Outdoor Crest series boilers, including models OFN(L) 2501 through 6001. This assembly includes the ignitor electrode and a specialized mounting gasket to ensure a gas tight seal against the combustion chamber.